Fluorapophyllite-(Na) Miura Y, Kato T, Rucklidge J C, Matsueda H American Mineralogist 66 (1981) 410-423 Natroapophyllite, a new orthorhombic sodium analog of apophyllite II. Crystal structure Locality: the Sampo mine, Okayama, Japan _database_code_amcsd 0000830 8.875 8.881 15.79 90 90 90 Pnnm atom x y z Biso Si1 .2289 .0833 .1890 1.12 Si2 .4161 .2708 .3108 1.13 Ca1 .1143 .2465 0 1.20 Ca2 .7537 .1148 0 1.25 Na 0 0 .5 2.84 F 0 0 0 1.87 O1 .3671 .1322 .2513 1.36 O2 .0882 .1902 .2162 1.63 O21 .3099 .4123 .2839 1.59 O3 .2696 .0987 .0921 1.75 O31 .4016 .2305 .4079 1.66 O4 .2286 .4505 .0887 2.45 O41 .5502 .2253 .0890 2.70 H1 .47 .17 .05 1.60 H11 .17 .54 .08 1.40 H2 .16 .43 .14 0.80 H21 .56 .31 .14 3.20